1 The diagram shows a triangle \(A B C\).
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The lengths of \(A C\) and \(B C\) are 5 cm and 4.8 cm respectively.
The size of the angle \(B C A\) is \(30 ^ { \circ }\).
- Calculate the area of the triangle \(A B C\).
- Calculate the length of \(A B\), giving your answer to three significant figures.